Curse of the Oba
Lalali-Puy has taught you how to use the primal spirits to drain the vitality of an enemy
Sorcerer-King's Boon 13,000 gp
Power (Necrotic) Daily (Minor Action)
One enemy within 5 squares of you is blighted (save ends). While blighted and within 10 squares of you, that enemy takes necrotic damage the first time on each of your turns that you deal damage to a creature other than that enemy. The damage equals 2 + your Wisdom modifier.
Published in Dragon Magazine 395.